<!DOCTYPE hml>
<html>
<body>
<script src="../../resources/js-test-pre.js"></script>
<script>
description("Tests that the 2 first parameters of addEventListener() / removeEventListener() are mandatory.");

shouldThrow("addEventListener()");
shouldThrow("addEventListener('load')");
shouldThrow("removeEventListener()");
shouldThrow("removeEventListener('load')");

// The second parameter should be nullable (no exception thrown).
shouldNotThrow("addEventListener('load', null)");
shouldNotThrow("addEventListener('load', undefined)");
shouldNotThrow("removeEventListener('load', null)");
shouldNotThrow("removeEventListener('load', undefined)");
</script>
<script src="../../resources/js-test-post.js"></script>
</body>
</html>